73661906 has 8 divisors (see below), whose sum is σ = 110547084. Its totient is φ = 36812880.

The previous prime is 73661899. The next prime is 73661909. The reversal of 73661906 is 60916637.

It can be written as a sum of positive squares in 2 ways, for example, as 71995225 + 1666681 = 8485^2 + 1291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73661906.

It is not an unprimeable number, because it can be changed into a prime (73661909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3185 + ... + 12548.

Almost surely, 2^73661906 is an apocalyptic number.

73661906 is a deficient number, since it is larger than the sum of its proper divisors (36885178).

73661906 is a wasteful number, since it uses less digits than its factorization.

73661906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18076.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 73661906 is about 8582.6514551157. The cubic root of 73661906 is about 419.1932852063.

The spelling of 73661906 in words is "seventy-three million, six hundred sixty-one thousand, nine hundred six".